Method for manufacturing multi-section cylindrical cast coil wound with round winding wire

Abstract

The invention discloses a method for manufacturing a multi-section cylindrical cast coil wound with a round winding wire, wherein the coil is divided into left and right halves and directly wrapped on a coil casting mold with a glass fiber gridding (4), the two sections of a tapping section are arranged in the middle part and taken as starting sections, the round winding wires (1) of the wire turns of the two starting sections are wound so that the cross section is arranged in an isosceles trapezoid form, the wire turns of the rest sections are orderly against the starting sections, a round electromagnetic wire (1) is wound continuously without being cut so that the cross section is arranged in a parallelogram form and special-shaped positioning blocks (2) are arranged between the sections of the round electromagnetic wire (1) and evenly distributed at the circumference to separate out and position the sections, and finally, an epoxy resin (3) is cast in vacuum and then pressurized. The method has the advantages that the filling rate of the arrangement of the electromagnetic wire inside the coil is increased, the operation is convenient, the electrical strength and various other technical performance indexes of a transformer are all up to relevant specifications of national standards, and as a result, a high-efficiency energy-saving transformer, which is compact in structure, small in volume, low in material consumption, low in cost and high in electrical strength, is manufactured.

Description

technical field [0001] The invention belongs to the field of transformer manufacturing; it relates to a multi-segment cylindrical casting coil, in particular to a manufacturing method of a multi-segment cylindrical casting coil wound with circular winding wires. Background technique [0002] For the high-voltage coils of small-capacity 10-35KV epoxy resin casting transformers, due to the small current, when the cross-sectional area of ​​the selected copper winding wire is less than 4 square millimeters, it is very difficult to manufacture and wind such a small flat winding wire. , had to choose the round winding wire. In order to make the insulating material operate reliably within the safe voltage range, the coil is usually designed as a multi-segment multi-layer cylindrical structure with more than 2 segments to reduce its inter-layer voltage and inter-segment voltage, and an extra insulating material is placed between the layers And the method of opening the distance bet...

AI Technical Summary

Problems solved by technology

However, this winding method cannot be directly wound on the casting mold because the beginning of each section is pressed on the bottom layer and needs to be welded with other sections. It must be wound section by section with a special winding mold, and then the winding is removed from the special winding mold. A finished section of coil is placed on the coil casting mold in turn

It can be seen that although segmented coils with rectangular or square cross-sections can reduce the waste of internal space of the coils, doing so brings difficulties in the positioning of the package, and the wire ends need to be welded between each adjacent segment, which is labor-intensive and time-consuming. And too many solder joints can easily cause unbalanced resistance and local overheating, and many potential problems

[0019] In addition, in order to directly wind each section of coil into a circular winding wire cross-section on the casting mold to form an approximately rectangular or square segmented coil, some transformer manufacturers adopt the method of fixing a section with a clamp for each winding section, which is very inconvenient in operation. Convenient, and easy to damage the turn insulation

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